Abstract
When solving the problems regarding the forma� tion of sulfide ores at deposits of various genetic types, one of the key factors is the isotopic composition of sulfur. Such an approach implies definition of either the mantle or the crustal source of sulfur. This problem becomes especially topical when considering igneous copper–nickel deposits localized in ultrabasite–basite complexes. The mantle origin of the melts that formed these deposits and the ores proper is usually recog� nized by most geologists and is based mostly on the
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